ポリマー表面活性物質のコロナは,溶媒のないタンパク質液体内の水を動的に置き換え,マクロ分子柔軟性と活性性を確保します
François-Xavier Gallat1, Alex P S Brogan, Yann Fichou
1Institut de Biologie Structurale, Comissariat à l'Energie Atomique, F-38054 Grenoble, France.
Journal of the American Chemical Society
|August 3, 2012
まとめ
溶媒のないハイブリッドのタンパク質ダイナミクスは,水素化されたタンパク質に似ています. ポリマー表面活性剤は,水のようなタンパク質構造を可塑化し,従来の溶媒なしで生物学的活動を可能にします.
科学分野:
- バイオフィジックス 生物物理学
- マテリアルサイエンス 材料科学
- タンパク質のダイナミクス
背景:
- 伝統的な理解では,水性または非水性溶媒はタンパク質の動態および機能に不可欠であると仮定しています.
- タンパク質-ポリマー表面活性剤のハイブリッドは生物学的活性を示し,この溶媒中心的な見解に異議を唱える.
研究 の 目的:
- 溶媒のないタンパク質・ポリマー・サーファクタント・ハイブリッドにおけるタンパク質とポリマー・ダイナミクスを調査する.
- タンパク質の運動と機能を媒介するポリマー表面活性剤のコーティングの役割を理解する.
主な方法:
- 弾性非一貫中性子散射 (EINS) を利用して原子の運動を検出した.
- タンパク質とポリマーの移動を独立して追跡するために特定のデュテリウムラベルを使用しました.
- 溶剤フリーハイブリッドシステムの動態を分析した.
主要な成果:
- ハイブリッドにおけるミオグロビンの内部運動は,水素化されたタンパク質の動きをよく模倣した.
- ポリマー表面活性剤のコーティングは,水解水と同様の動きを示した.
- ポリマーコーティングが水の可塑化効果を複製できることを実証した.
結論:
- 溶媒のないタンパク質-ポリマー表面活性剤のハイブリッドは,機能に不可欠なタンパク質のダイナミクスをサポートすることができます.
- ポリマー表面活性剤のコーティングは,水のようなタンパク質構造の効果的な可塑剤として作用します.
- タンパク質の生物学的活性に対する伝統的な溶媒の必要性を疑問視する.
関連する概念動画
01:27Surface Active Agents
Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
03:22Colloids
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
01:30Micelles
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
01:23Membrane Fluidity
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
01:26Membrane Fluidity
Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
01:29The Colloidal State
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...